A lot of the good Valor players I knew that got to 60 then went to sver to try something new (and chose sver before raven because they wanted it easier). Their maps are easier to defend on average. It's a viscous cycle that good players migrate to the good team, and further unbalance everything. I think it's kind of funny you guys actually think the SVER community is somehow more mature and more team oriented than the other factions. They're really not that different. Like someones' call of duty background makes them chose valor? I don't get that..
The thing is when you're winning, you tend to feel better, and tend to open up and actively communicate. When your ass is getting handed to you, communication won't happen because it will just be whining and complaining if it does happen. It's the the viscous cycle again, with players on sver becoming more and more teamwork oriented and communication oriented than the other factions as time goes on. It's as simple as when you're winning you relax and open up, when you're not It's always less welcomed.